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001-es BibID:	BIBFORM120837
035-os BibID:	(WoS)000786690500002 (Scopus)85127876558
Első szerző:	Sirunyan, A. M. (fizikus)
Cím:	Using Z Boson Events to Study Parton-Medium Interactions in Pb-Pb Collisions / A. M. Sirunyan, CMS Collaboration
Dátum:	2022
ISSN:	0031-9007
Megjegyzések:	The spectra measurements of charged hadrons produced in the shower of a parton originating in the same hard scattering with a leptonically decaying Z boson are reported in lead-lead nuclei (Pb-Pb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. Both Pb-Pb and pp data sets are recorded by the CMS experiment at the LHC and correspond to an integrated luminosity of 1.7 nb-1 and 320 pb-1, respectively. Hadronic collision data with one reconstructed Z boson candidate with the transverse momentum pT>30 GeV/c are analyzed. The Z boson constrains the initial energy and direction of the associated parton. In heavy ion events, azimuthal angular distributions of charged hadrons with respect to the direction of a Z boson are sensitive to modifications of the in-medium parton shower and medium response. compared to reference data from pp interactions, the results for central Pb-Pb collisions indicate a modification of the angular correlations. The measurements of the fragmentation functions and pT spectra of charged particles in Z boson events, which are sensitive to medium modifications of the parton shower longitudinal structure, are also reported. Significant modifications in central Pb-Pb events compared to the pp reference data are also found for these observables.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Binary alloys Bosons Colliding beam accelerators Hadrons Lead alloys
Megjelenés:	Physical Review Letters. - 128 : 12 (2022), p. 1-19. -
További szerzők:	Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Zilizi Gyula (1965-) (fizikus) CMS Collaboration
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